不同制备方法下（C/C）/ZrB2-SiC复合材料的抗烧蚀性能

Ablation performance of （C/C）/ZrB2-SiC composites by different fabrication methods

采用涂刷法和浆料浸渍法在(C/C)/SiC复合材料基础上制备了(C/C)/ZrB2-SiC复合材料,采用微观分析和氧-乙炔烧蚀试验,并借助SEM、EDS等手段,研究三种材料的微观结构、抗烧蚀性能和抗烧蚀机制。结果表明:制备的(C/C)/ZrB2-SiC复合材料的抗烧蚀性能优于(C/C)/SiC复合材料,相比(C/C)/SiC复合材料,涂刷法制备的(C/C)/ZrB2-SiC复合材料600s和1000s线烧蚀率下降33.3%和15.4%,质量烧蚀率下降51.5%和25.5%;浆料浸渍法制备的(C/C)/ZrB2-SiC复合材料600s和1000s线烧蚀率下降20%和28.8%,质量烧蚀率下降42.4%和53.2%,其在高温阶段形成的ZrO2-SiO2玻璃态熔融层起到了抗氧化冲刷的作用,大幅提高其抗烧蚀性能。三种材料的烧蚀机制是热化学烧蚀、热物理烧蚀和机械剥蚀的综合作用。

The(C/C)/ZrB2-SiC composites were prepared by slurry painting method and slurry impregnation method based on(C/C)/SiC composites.The ablation characteristics,phase composition and microstructure of the three kinds of composites were tested by oxyacetylene flame,SEM and EDS,respectively.The ablation mechanism was also investigated.The results indicate that compared with(C/C)/SiC composites,the(C/C)/ZrB2-SiC composites show better ablation resistance properties.As to the uncoated(C/C)/SiC composites,the linear ablation rate of the(C/C)/ZrB2-SiC composites is reduced by 33.3%and 15.4%,and the mass ablation rate reduces by 51.5%and 25.5%after ablation for 600 sand 1000 srespectively,and the linear ablation rate of the micro-particle ZrB2 impregnation composites is reduced by 20%and 28.8%,and the mass ablation rate reduces by 42.4%and52.3%after ablation for 600 sand 1000 srespectively.A ZrO2-SiO2 glassy melting layer formed at high temperature plays an important role in antioxidant and antierosion,which induces in better ablation resistance properties of the(C/C)/ZrB2-SiC composites.The ablation mechanism is a synergistic effect of thermo-chemical ablation,thermo-physical ablation and mechanical erosion.